Remote control and indication system



Sept. 24, 1940. H. s. YOUNG REMOTE CONTROL AND INDICATION SYSTEM FiledFeb. 6, 1939 f m a &5 9 6 w 0a 7 LI T l L W1 "vb/J) a, 5 w 9 0 a a H 0 45 0 0 P 2 Aug 15 0 @w 5 4 4 5 m 5 W 22 7 9 .6 1 4 4 W E1 a 4 5 0 '5 a M5 w 6 91 4 9 M 5 MI 78 99 5 z a 2 B; W 5 A $4 M 1 a fl w 4 B o 5 "b! m 5H 5 AW 0 w HIS ATTORNEY Patented Sept. 24, 1940 W l UNITED srar ss mm(@FFMZF.

REMOTE CONTROL AND INDIGATION SYSTEM Henry S. Young, VVilkinsburg, Pa,assignor to The Union Switch & Signal Company, Swissvale, Pa., acorporation of Pennsylvania.

Application February 6, 1939, Serial No. 254,84? 7 v 4 Claims. (01.246-219) My invention relates to an improved remote The signal IS has anupper arm lSA which control and indication system and particularlycontrols movement of trains from left to right to a system forcontrolling from a remote point in the track A, while the signalis-provided with a railway track switch and the associated siga lowerarm ISB which controls movement of nals, and for providing indicationsof the contrains from left to'right from track A to track B. 5 dition ofthe switch and of the signals. The signals areshown in the drawing asbe- It is an object of my invention to provide an ing of the semaphoretype, but it should be unimproved system of the type describedemployderstood that other types of signals, such as color ing a minimumof line conductors and which is light or position light signals, may beemployed in reliable in operation. if desired. I

A further object of my invention is to pro- The switch W is movedbetween a normal and vide an improved system which will operate to areverse position by suitable power driven supply accurate indications ofthe position of the switch machine SM which may be either of the switchand of the condition of the associated electric" or of the pneumatictype.

1-.- signals, and which, in the event portions of The switch machine SMis controlled by a 16 the equipment donot function in the intendedpolarized switch control relay WR, while the manner, will not give anyindicationwhatever switch W has associated therewith a polarized of theposition of the switch or of the condition switch repeating relay WPR, apolarized signal of the signals, and, therefore, will not give falsecontrol relay HR. and a coding relay CT.

20 indications. l A switch control lever SL is provided to con 20 Afurther object of the invention is to protrol the polarity of thecurrent supplied to the vide an improved remote control and indicationwinding of the switch control relay WR and system employing a relayenergized by current thereby control the switch W, while a signalsupplied over a control circuit for effecting concontrol lever K isprovided to control the po- 5 trol of a device, the system incorporatingmeans larity of the current supplied to the winding of governed by thedevice for periodically varying the signal control relay HR and therebycontrol the resistance of the control circuit to thereby the signalsassociated with the switch W. produce fluctuations in the value of thecurrent The switch control lever SL and the switch in thecontrolcircuit, the system also having indication relay WKRcooperate tocontrol the means responsive to fluctuations inthe value of circuits forenergizing the normal switch indi- 30 the current in the control circuitfor, providing cation lamp NK and the reverse switch indian indicationcation lamp RK.

Another object of my invention is to provide "I'he si-gnal control leverK and the signal an improved switch control and indication sysindicationrelay GPR cooperate to control the :7; emcircuits for energizing theleft signal indica- Otherobjects of my invention and features of tionlamp LGK, and the right signal indication novelty will be apparent fromthe following delamp RGK.

scription taken in connection with the accom- The switch ,control leverSL is movable bel fl y dr win tween a normal and a reverse position andhas v I shalldescribe one form of improved control associated therewithmovable contacts liland ll. 40 system embodying my invention, and shallthen Contact in controls the polarity of the current pointout the novelfeatures thereof in claims. supplied from battery M to switch controlwires In the drawing the single figure is a diagram l5 and M5 by meansof which current is supplied of a system embodying my invention. tothewinding of the switch control relay WR. Referring to the drawing,there is shown there- The control wire I5- is connected to one terin astretch of railway track A and a branch minal'of the winding of switchcontrol relay track B, while a switch W controls movement of WR, whilewire I5 has connected in series theretrains between the two lines oftrack. Movewith primary winding ll of transformer TRI. ment of trainsacross the switch W from left The control wire 16 serves as a commonwire for so to right, as viewed in the drawing, is controlled boththe'switch and signal control circuits and 5 by a signal is, whilemovement of trains from is connected to one terminal 01. the winding ofright to left on track A is controlled by a sigthelswitch control relayWR, and also to one nal AS, andniovement of trains from right toterminal of the winding of the signal control left in track B and ontotrack A is controlled by relay HR,

a signal BS. Control wire I6 is constantly connected to the 55 centerterminal C of battery l4, while control wire 15 is connected to contactl0 associated with the switch control lever SL.

hen the lever SL is in the normal position as shown, contact I0 engagesa stationary contact l8 which is connected by wire 19 to terminal D ofbattery M with the result that current of one relative polarity, whichmay be considered as normal polarity, is supplied from terminals D and Cof the battery 14 to the control wires 15 and [6.

When the switch control lever SL is in the reverse position, contact I0engages contact which is connected by wire 22 to terminal E of battery[4 so that current of the opposite or reverse relative polarity issupplied from terminals E and C of battery 4 to the control wires 15 andHi.

The switch control relay WR has a neutral contact 25 which when pickedup engages a stationary contact 26 which is connected by wire 27 toterminal R of battery 30. Contact 25 is connected by wire 3! to polarcontact 32 of relay WR, while contact 32 when in the normal position, asshown, engages a normal polar contact 34 which is connected by wire 35to the switch machine SM. The switch machine is connected by wire 31 toterminal P of battery 30.

When polar contact 32 of relay WR is in the reverse position, it engagesreverse polar contact 43 which is connected by wire 4| to the switchmachine SM.

The details of the control of the switch machine SM by the relay WRiormno part of my invention and any suitable control system for the controlof the switch machine may be employed. The control system operates sothat when the neutral contact 25 of relay WR is picked up and polarcontact 32 is in the normal position, current is supplied to the switchmachine SM to cause this machine to move the switch W' to the normalposition. Similarly, when the neutral contact 25 is picked up and thepolar contact 32 is in the reverse position, current is supplied to theswitch machine SM to cause the machine to move the switch W to thereverse position.

The circuit of the winding of the relay WR and also of relay HR may becontrolled by lock or route relays, not shown, in the manner well knownin the art so that the winding of the relay WR can be energized onlywhen it is safe to effect a change in the position of the switch W.

The switch W has associated therewith contacts 44 and 45 which aremovable'in accordance with movement of the switch and which control thesupply -of current to the winding of the switch repeating relay WPR.

When the switch W is in the normal position as shown, contact 44, whichis connected by wire 4! to one terminal of the winding of relay WPR,engages contact 48 to which is connected a branch of wire 21 leadingfrom the terminal R of battery 3|].

In this position of the switch W contact 45, which is connected by wire50 to the other terminal of the winding of relay WPR, engages contact 5!to which is connected a branch of vire 31 leading from terminal P ofbattery 30. Accordingly, in this position of the switch W current of onerelative polarity, which may be considered normal polarityfis suppliedto the winding of relay WPR.

When the switch W is in the reverse position,

contact 45 engages contact 48, while contact 44 engages a contact 52 towhich is connected a branch of wire 31.

Accordingly, in the reverse position of the switch W, current of theopposite or reverse relative polarity is supplied to the winding ofrelay WPR'.

The contacts 44 and 45 and the associated stationary contacts arearranged so that the circuit controlled by the contacts 44 and 45 iscomplete only when the switch W is in the normal or the reverseposition, and is interrupted when the switch is in transit between thesepositions.

While the contacts 44 and 45 have been described as being in engagementwith the stationary contacts associated therewith when the switch W isin its normal or reverse position, it is contemplated, as is well knownin the art, that these contacts may be closed when and only when theswitch W is in one orthe other of its two positions, and is locked inthat position.

The coding relay CT has a winding which is constantly energized from thebattery 30, while the relay has a contact 55 which alternately engages afront contact 56 and a back contact 58. The contact 55 may be operatedat any suitable frequency, as.f0r instance, 120 or 180 times a minute.

The signal control lever K has a neutral or center position I and ismovable therefrom in one direction to a position R in which itconditions the signals associated with the switch W for movement oftrains to the right as viewed in the drawing, while the lever K ismovable from the center position I in the other direction to a positionL in which it conditions the signals associated with the switch W formovement of trains to the left as viewed in the drawing.

The lever K has associated therewith contacts 60 and 6! which aremovable in accordance with movement of the lever. When the lever K is inthe position R, contact 60 engages contact 62 to which is connected abranch of wire l9 leading from the terminal D of battery M. while whenthe lever K is in the position L, contact 60 engages a contact 64 towhich is connected a branch of wire 22 leading from terminal E ofbattery l4.

Contact 60 has connected thereto control wire 65 which has connected inseries therewith primary winding 66 of transformer TRZ. Control wire 65is connected to one terminal of the wind ing of signal control relay HR,the other terminal of which has connected thereto common wire l6 leadingfrom terminal C of battery l4.

It will be seen, therefore, that when lever K is in the position R,current of one relative polarity, which may be considered as normalpolarity is supplied from terminals D and C of battery G4 to controlwires [6 and 65 leading to the winding of signal control relay HR, whilewhen the lever K is in the position L, current of the opposite orreverse relative polarity is supplied from terminals C and E of batteryM to the control wires l6 and 65.

The signal control relay HR and the switch repeating relay WPR cooperatein the manner hereinafter described in detail to control the circuitsfor the signals associated with the switch W.

The relay HR has a neutral contact 66 to which is connected a branch ofwire 21 leading from terminal R of battery 30. Contact 96 when picked upengages contact 91 which is connected by wire 68 to polar contact I9 ofthe relay I-IR. Contact I9 when in thenormal position, as shown, engagespolar contact II which is connected by wire I2 to contact I4 of switchrepeating relay WPR.

Relay WPR has a neutral contact I5 which when picked up engages contact74, while contact 75 is connected by wire I6 to polar contact 19 of therelay. Contact 18 when in the normal position, as shown, engages normalpolar contact 89 which is connected by wire 8| to the operatingmechanism of the upper signal ISA of signal I S, while this mechanism,as well as the mechanisms of the other signals, has connected thereto abranch of wire 31 leading from terminal P of battery 39.

The polar contact I8 of relay WPR when in the reverse position engagesreverse polar contact 93 which is connected by wire 84 to the operatingmechanism of the lower signal IS'B of signal IS.

The polar contact I9 of the signal control relay HR, when in the reverseposition, engages reverse polar contact which is connected by wire 91 tocontact 88 of relay WPR. Relay WPR has a neutral contact 99 which whenpicked up engages contact 88, while contact 99 is connected by wire 9|to polar contact 93 of the switch repeating relay WPR,

Contact 93 of relay WPR when in the normal position, as shown, engagesnormal polar contact 94 which is connected by wire to the operatingmechanism of the signal AS. Contact 93 when in the reverse positionengages reverse polar contact 99 which is connected by wire 98 to theoperating mechanism of the signal BS.

The circuits of the wires 8|, 84,95 and 99 leading to the mechanisms ofthe signals associated with the switch W may be controlled by route orlooking relays in the manner customary and well known in the art or byother means responsive to traffic conditionsin-the vicinity of theswitch W so that the signals can be cleared when and only when it issafe to do so.

The transformer TRI has a secondary winding I99 which is connectedthrough an asymmetric unit or rectifier I M to'the winding of switchindication relay WKR. The relay WKR has a contact I92 which when pickedup engages a contact 93 to which is connected" a branch of wire I9leading from the terminal D of battery I4. Contact I92 is connected bywire I94 to lever operated contact II. When the lever SL is in thenormal position N as shown, contact :II engages contact I95 to which isconnected one terminal of normal switch indication lamp NK, the otherterminal of which has connected thereto wire 22 leading from terminal Eof battery I4, It will be seen, therefore, that when the contact I92 ofrelay WKR is picked up and the switch control lever SL is in the normalposition, the lamp NK is lighted.

When the lever SL is inthe reverse position R, contact I i engagescontact I91 which is connected to one terminal of the reverse switchindication lamp RK, the other terminal of which is connected to wire 22.It will be seen, therefore,.that when the contact I92 of relay WKR ispicked up and the lever SL is in the reverse position, the lamp RK islighted.

The transformer TR2 has a secondary winding H9 which is connectedthrough an asymmetric unit or rectifier Hi to the secondary winding ofthe signal indication relay GPR. The relay GPR has a contact I I2 whichwhen picked up engages a contact I I4 to which is connected wire I9lead- .ing from terminal D of battery I4. Contact H2 is connected bywire II5 to contact 6| associated with signal control lever K.

When the lever K is in the position R as shown, contact 6| engagescontact In to which is connected one terminal of right signal indicationlamp RGK, the other terminal of which is connected to wire 22. Whencontact II2 of relay GPR is picked up, therefore, at a time when thelever K is in position R, a circuit is established to illuminate theright signal indication lamp RGK.

When the lever K is in the position L, contact SI engages a contact II8to which is connected one terminal of the left signal indication lampLGK, the other terminal of which is connected to wire 22. Accordingly,when contact IIZ of relay GPR is picked up and lever K is in position L,a circuit is established to illuminate left signal indication lamp LGK.

The windings of the switch control relay WR and of the signal controlrelay HR are of relatively high resistance, as for example 599 ohms,with the result that relatively little current flows in the controlcircuits in which these windings are included in series. Thecontinuously operating contact 55 of the coding relay CT operates attimes, as explained in detail below, to intermittently shunt thewindings of the relays WR and HR, and thus efiect an increase in theflow of cur- 9 rent in the control circuits for these windings. Theresulting pulsations or fluctuations in the value of the current inthese circuits causes current to be induced in the secondary windings ofthe transformers TRl and TRZ so that current is supplied from, thesetransformer windings to the windings of the indication relays WKR. andGPR.

The contact 55 of coding relay CT when picked up engages contact 59which is connected by Wire 529 to contact I2I of relay WPR, whilerelayWPR has a neutral contact I22 which when picked up engages contactIZI Contact I22 is connected by wire I23 to polar contact I2 5, whilepolar contact I24 when in the normal position, as shown, engages normalpolar contact I26 which is connected by wire I2'I to normal polarcontact I28 of switch control relay WR.

When polar contact E24 is in the reverse position, it engages reversepolar contact I39 which is connected by wire I3I to reverse polarcontact I32 of relay WR.

The switch control relay WR has a contact I34 Which engages the contactsI28 and H32, while contact E34 is connected by wire I35 to contact 35.The switch control relay WR has a neutral contact I38 which when pickedup engages contact I 35, while contact I39 has a branch of control wireI5 connected thereto.

It will be seen, therefore, that when the windings of relays WR and WPRare both energized with current of the same relative polarity so thattheir polar contacts are in the same relative positions, a circuit isestablished by the neutral and polar contacts of these relays to connectwire I5 to contact 59 of coding relay CT. When contact 55 of the relayCT is picked up, it establishes connection from contact 55 to wire I9 sothat acircuit shunting the winding of switch control relay WR isestablished between wires I5 and I9.

' When contact 55 of relay CT is released, it engages contact 58 whichis connected by wire I49 to contacts controlled in any suitable mannerWell known in the art in accordance with the position of the signalsassociated with the switch W. These contacts are controlled in suchmanner that each contact is open when the signal with which it isassociated is displaying the stop indication, while the contact isclosed when the associated signal is displaying a proceed indication orwhen the signal arm or signal mechanism is at any point intermediate thestop and proceed positions.

For ease in identification each of the contacts associated with thesignals has placed adjacent thereto the reference characters of thesignal with which the contact is associated.

The signal ISA has associated therewith a movable contact M2 whichengages at times a stationary contact I43 which is connected by wire I44to normal polar contact I45 of relay HR.

The signal l SB has associated therewith a movable contact I4'I whichengages at times a stationary contact I46 to which is connected a branchof wire I44.

It will be seen that when either signal ISA or ISB is displaying aproceed indication, connection is established between wire I and normalpolar contact I of relay HR. Similarly, when both signals ISA and I SBare displaying a stop indication, no connection is established from wireI40 to contact I45. The signal BS has associated therewith a movablecontact I48 which engages at times stationary contact I49 which isconnected by wire I50 to reverse polar contact I52 of relay HR.

The signal AS has associated therewith movable contact I53 which attimes engages contact I55 to which is connected a branch of wire I50. Itwill be seen that when either signal AS or BS is displaying the proceedindication, a circuit is established between wire I40 and reverse polarcontact I52 of relay HR, while when both of these signals are displayingthe stop indication, no connection is established between wire I40 andcontact I52.

The signal control relay HR has a polar contact I56 which at timesengages the contacts I45 01 I52, while contact I56 is connected by wireI57 to contact I58.

The relay HR has also a neutral contact IBI which when picked up engagescontact I58, while contact I has connected thereto a branch of controlwire 65.

It will be seen, therefore, that when the signal control relay HR isenergized with current of one or the other relative polarity tocondition the signals associated with the switch W to permit movement oftrains in one direction or the other across the switch, and when, inaddition, one of the signals is displaying the proceed indication,connection is established between control wire and wire I40 leading tocontact 58 of coding relay CT.

Accordingly, when contact 55 of relay CT is released and engages contact58 to thereby establish connection between control wire I5 and wire I40,a circuit shunting the winding of the signal control relay HR. isestablished between the control wires I5 and 65.

The equipment is shown in the drawing in the position which it assumeswhen the switch control lever SL and the switch W are in their normalpositions, and when the signal control lever K is in the position R.

As the switch control lever SL is in the normal position, contact I0engages contact I8 to which is connected wire I9 leading from terminal Dof battery I4 with the result that current of normal relative polarityis supplied from terminals D and C of battery I4 to the control wires I5and I6 leading to the winding of the switch control relay WR.Accordingly, the winding of the switch control relay W is energized withcurrent of normal relative polarity and the neutral contacts 25 and I38of the relay are picked up, while the polar contacts 32 and I34 are intheir normal positions as shown.

As the signal control lever K is in the position R. contact 60 engagescontact 62 to which is connected a branch of wire I9 leading fromterminal D of battery I4 with the result that current of normal relativepolarity is supplied from terminals D and C of battery I4 to the controlwires 65 and I6 leading to the winding of the signal control relay HR.Accordingly, the neutral contacts 66 and I60 of signal control relay HRare picked up, while the polar contact I0 and I 56 of this relay are intheir normal positions as shown.

At this time as the switch W is in the normal position, current ofnormal relative polarity is supplied over the circuits controlled by theswitch operated contacts 44 and 45 to the winding of the switchrepeating relay WPR with the result that the neutral contacts I22, I5and 90 of this relay are picked up, while the polar contacts I24, I8 and93 of the relay are in their normal positions as shown.

As the polar contact I34 of switch control relay WR. is in the normalposition, and as the polar contact I24 of switch repeating relay WPR isalso in the normal position, a circuit is established from wire I5 tocontact 56 of the coding relay CT. This circuit is traced from wire I5through neutral contacts I38I36 of relay WR, wire I35, normal polarcontacts I34-I28 of relay WR, wire I21, normal polar contacts I26--I24of relay WPR, wire I23, neutral contacts I22I2I of relay WPR, wire I20,and contact 56.

When the contact 55 of coding relay CT is picked up, connection isestablished from wire I6 to contact 55 with the result that a circuitshunting the winding of the relay WR is established. When this circuitis complete, the resistance of the circuit of the control wires I5 andI6 is greatly reduced and there is a corresponding increase in the valueof the current flowing in this circuit, and, therefore, in the primarywinding H of transformer TRL On the next operation of the contact 55 ofthe coding relay CT, it is moved out of engagement with the contact 56,thereby interrupting the circuit shunting the winding of the switchcontrol relay WR. On interruption of thi shunt circuit, the winding ofthe relay WR is again included in series with the circuit of the controlwires I5 and I6 with the result that the resistance of this circuit issubstantially increased, and there is a corresponding reduction in thevalue of the current flowing in this circuit, and, therefore, in theprimary winding I! of transformer TRI.

On the next operation of the contact 55 of relay CT it is again movedinto engagement with contact 56 to again establish the circuit shuntingthe winding of relay WR, and there is an increase in the flow of currentin the circuit of the control wires I5 and I5, and, therefore, in theprimary winding ll of transformer TRI.

It will be seen that as a result of operation of the contact 55 ofcoding relay CT, the value of the current flowing in the control wiresI5 and I6, and, therefore, in the primary winding ll of transformer TRI,is intermittently varied with the result that current is induced in thetransformer secondary winding Hi from which current is supplied throughthe rectifier IIlI to the winding of the switch indication relay WKR.

Accordingly, contact I02 of switch indication relay WKR is picked up,while as the switch control lever SL is in the normal position, contactII engages contact I05 so that the circuit of the normal indication lampNK is complete, and this lamp is illuminated to indicate to the operatorthat the switch W occupies the normal position.

At this time as the polar contact I8 of switch indication relay WPR isin the normal position and as polar contact 10 of signal control relayHR is also in the normal position, a circuit is established to energizethe operating mechanism of signal ISA to cause this signal to displaythe clear indication.

The circuit for energizing the mechanism of signal ISA is tracedfromterminal R of battery 35 through wire 21, contacts (iii-5T of relayHR, wire 68, normal polar contacts Iii'H of relay HR, wire 12, neutralcontacts Ii-I5 of relay WPR, wire Iii, normal polar contacts 78-85 ofrelay WPR, wire 8! to the mechanism of signal ISA which is connected bywire 3'! to terminal P of battery 30.

As the signal ISA is displaying the clear indication, the contact Hi2associated with this signal is closed. As the polar contact I56 of relayHR is in the normal position, a circuit is established from control wire65 to contact 58 of the coding relay CT.

This circuit is traced fromcontrol Wire 65 through neutral contactsHill-458 of relay HR, wire I51; normal. polar contacts l5li---HI,5 ofrelay HR, wire I44, signal controlled contacts I ia-M2 of signal ISA andwire I45 to contact 58.

On movement of contact 5.5 of coding relay CT to its released positionit engages contact 58 and establishes a circuit between wires 65 .l andI6 shunting the winding of signal control relay CT it is moved out ofengagement with contact 58, thereby interrupting the circuit shuntingthe winding of signal control relay HR, with the result that the windingof the relay HR is again included in series with the circuit of thecontrol wires 65 and I6. Accordingly, the resistance of this circuit issubstantially increased and there is a corresponding reduction in theyalue of the current flowing in the circuit, and, therefore, in thetransformer primary winding 65. As a result of operation of the contact55 of relay CT the value of the current flowing in the circuit of whichthe control wire 65 forms a part is constantly fluctuating with theresult that current is induced in the secondary winding IIU of thetransformer TRZ.

Current, therefore, is supplied from the secondary winding I ll] oftransformer TR2 through the rectifier III to the winding of the signalindication relay GPR. Accordingly, contact H2 of relay GPR is picked up,while as the signal control lever K is in position R at this time,contact 6| establishes a circuit for the right signal indication lampRGK with the result that this lamp is illuminated to indicate to theoperator that the signals associated with the switch W are conditionedfor movement of trains to the right.

When the contact 55 of the coding relay CT establishes the circuitsshunting the windings of the relays VVR and HR, there is a reduction inthe degree of energization of these windings. However, the rate. ofoperation of the contact 55 of relay CT is such that the periods duringwhich the windings of the relays WR and HR are shunted are relativelyshort with the result that the neutral contacts of these relays remainpicked up between periods of energization of the relay windings.

Furthermore, when the circuit shunting the winding of either of therelays is established,

A to track B, he may do so by moving the switch supplying current ofreverse relative polarity from terminals C and E of the battery M to thecontrol wires I5 and I6.

On movement of the lever SL out of the normal position, contact II ismoved out of engagement with the contact I05 to thereby interrupt thecircuit of the lamp NK. 1

On the supply of current of reverse relative polarity to the circuit ofthe control wires I5 and I6 the neutral contacts 25 and I33 of relay WRbecome released and thereafter again pick Accordingly, the value of thecurrent in the circuit of the control wires I5 and It remains constantand no current is induced in the secondary winding IIJll of transformerTRI. As a result, the winding of switch indication relay WKR is notenergized and contact I02 of the relay is released so that neitherswitch indication lamp can be illuminated.

As a result of movement of the polar contact 32 of switch control relayWR to the reverse position, a circuit is established to energize theswitch machine SM to cause this machine to move the switch W from thenormal to the reverse position. v

On movement of the switch W away from the normal position, the contacts44 and 45, which are operated in accordance with movement of the switch,are moved out of engagement with the contacts 48 and 5|, therebyinterrupting the circuit of the winding of the switch repeating relayWPR. When the switch W attains the reverse position, contacts 44 and 45engage the contacts 52 and 48, respectively, and establish a circuit tosupply current of reverse relative polarity to the winding of the switchrepeating relay WPR. Accordingly, the neutral contacts I22, I5 and 90 ofthis relay become picked up, while polar contacts I24, I8 and 83 areshifted to their reverse positions.

When the polar contact I 34 of relay WR and the polar contact I24 ofrelay WPR are both in their reverse positions, the circuit shunting thewinding of switch control relay WR is again established and will beintermittently completed by the coding relay contact 55. Accordingly,there will be fluctuations or pulsations in the value of the currentflowing in the circuit of the control wires I5 and I6 with the resultthat the winding of the switch indication relay WKR will again beenergized and the contact I02 will be picked up.

At this time as the switch control lever SL is in the reverse position,contact II engages contact I01 so that the circuit of the right switchindication lamp RK is complete and this lamp is illuminated to informthe operator that the switch W is in the reverse position.

On movement of the switch W away from the normal position with resultantinterruption of the supply of current to the winding of the switchrepeating relay WPR by the contacts 44 and 45, the neutral contact I5 ofthis relay becomes released, thereby interrupting the circuit forsupplying current to the operating mechanism of the signal ISA. SignalISA, therefore, no longer dispays the proceed indication, but insteaddisplays the stop indication. On movement of the signal ISA to theposition to display the stop indication the contact I42 associated withthe signal is opened, thereby interrupting the previously traced circuitfrom control wire 65 to contact 58.

Accordingly, contact 55 of the coding relay CT is no longer able toestablish the circuit shunting the winding of the signal control relayHR, and accordingly, the current flowing in the circuit of control wires65 and I6 remains at the same uniform value. As a result, no current isinduced in the secondary winding IIO of transformer TR, and the windingof signal indication relay GPR is not energized, while contact H2 isreleased with the result that the lamp RGK is extinguished.

When the switch W attains the reverse position so that contacts 44 and45 effect the supply of current of reverse relative polarity to thewinding of the switch repeating relay WPR, polar contact I8 of relay WPRis shifted to the reverse position in which it engages contact 83 tothereby establish the circuit for supplying current to the operatingmechanism of signal 1 SB.

This circuit is traced from wire 21 leading from terminal R of battery30 through contacts 668I of signal control relay HR, wire 88, normalpolar contacts 10'II of signal control relay HR,

wire I2, neutral contacts 'I4I5 of relay WPR, wire 16, reverse polarcontacts 18-83 of relay WPR, wire 84, operating mechanism of signal ISB,and wire 31 to terminal P of battery 30.

On energization of the operating mechanism of signal ISB this signal iscaused to display the proceed indication, while the contact I41associated with the signal is closed, thereby reestablishing the circuitfrom control wire 65 to wire I40 leading to contact 58.

Accordingly, as a result of operation of contact 55 of coding relay CT,the circuit shunting the winding of signal control relay HR isintermittently established, while current is supplied by the transformerTR2 to the winding of signal indication relay GPR, as previouslyexplained. The contact II2, therefore, will be picked up, while as thesignal control lever K is still in the position R, its contact 6|engages contact II'I so that the circuit for the lamp RGK is complete,and this lamp is illuminated to indicate tothe operator that the signalpermitting movement of trains to the right at a time when the switch Wis in the reverse position has cleared.

If while the switch W is in the reverse position the operator wishes toreturn it to the normal position, he may do so by moving the switchcontrol lever SL from the reverse to the normal position. As a result ofthis movement of the switch control lever SL, contact I0 is moved out ofengagement with contact 20, thereby interrupting the supply of currentof reverse relative polarity to the control wires I5 and I6, while onmovement of the contact I0 into engagement with contact I8 current ofnormal relative polarity is again supplied to the control wires I5 andI6.

In addition, on this movement of the control lever SL contact II ismoved out of engagement with contact I01, thus interrupting the circuitfor energizing the lamp RK, while the contact I I is moved intoengagement with contact I05 to permit energization of the lamp NK onsubsequent picking up of the contact I02 of relay WKR.

On the supply of current of normal relative polarity to the controlwires I5 and I6, the neutral contacts of the relay WR become releasedand thereafter again become picked up, while the polar contacts 32 andI34 are shifted from their reverse to their normal positions.

On movement of contact I34 out of engagement with contact I32 at a timewhen the switch W is in the reverse position, the circuit for shuntingthe winding of relay WR is interrupted so that thereafter fluctuationsno longer occur in the value of the current flowing in the control wiresI 5 and I6. Accordingly, no current is supplied by transformer TRI tothe winding of relay WKR and its contact I02 is released.

On movement of contact 32 of relay WR to the normal position a circuitis established to effect operation of the switch machine SM to causemovement of the switch W to the normal position.

On movement of the switch W away from the reverse position the contacts44 and 45 interrupt the circuit for energizing the Winding of relay WPR,and the contact 15 of this relay becomes released to interrupt thecircuit for supplying current to the operating mechanism of the signalISB. Accordingly, the signal I SB no longer displays the proceedindication and is caused to display the stop indication.

When the signal ISB displays the stop indication, the contact I4! isopened, thereby interrupting the circuit shunting the winding of relayHR with the result that current of uniform value flows in the circuit ofthe control Wires 65 and I6. Accordingly, signal indication relay GPR isnot energized, and itscontact H2 is released and interrupts the circuitfor energizing the lamp RGK.

When the switch W attains the normal position, current of normalrelative polarity is again supplied by contacts 44 and 45 to the windingof switch repeating relay WPR and the polar contacts of this relay areshifted to their normal positions while the neutral contacts of therelay become picked up. On movement of polar contact I8 to the normalposition and on picking up of neutral contact I5, the previously tracedcircuit for supplying energy to the operating mechanism of signal ISA isestablished with the result that this signal again displays the proceedindication. I p

In similar manner, when polar contact I24 of relay WPR is in the normalposition and neutral contact I22 is picked up, the previously tracedcircuit for establishing connection between control wire I5 and contact56 of coding relay CT is again complete, and contact 55 of the codingrelay will intermittently establish the circuit shunting the winding ofr'elayWR. Accordingly, current will be supplied by the secondary windingI of transformer TRI to the switch indication relay WKR, and contact I02will become picked up to establish the circuit to illuminate the normalindication lamp NK.

In addition, on operation of signal ISA to display the proceedindication contact I42 is closed to again establish the circuit fromcontrol wire 55 to wire I40 leading to contact 58 of coding relay CT sothat the contact 55 intermittently establishes the circuit shunting thewinding of signal control relay HR. As a result, current will besupplied by the transformer TRZ to the winding of signal indicationrelay GPR, and the contact N2 of this relay will be picked up toestablish the circuit to illuminate lamp RGK.

If the operator wishes to condition the signals associated with theswitch W for movement of trains from right to left, he may do so bymoving the signal control lever K from the position R to the position L.

For purposes of illustration, it will be assumed that this movement ofthe lever K takes place at a time when the switch W is in the normalposition. l

On movement of the signal control lever K from the position R to theposition L contact 60 is moved out of engagement with contact 62,thereby interrupting the supply of current of normal relative polarityto the circuit of the control wires 55 and I 5, while when contact 60 ismoved into engagement with contact 54 it effects the supply of currentof-reverse relative polarity from terminals C and E of battery I4 tothecontr'ol wires 4 65 and I6.

In addition, on this movementof the signal control lever K, con-tact BIis moved out of engagement with contact I I! to thereby interrupt thecircuit of lamp RGK, while when lever K is in position L1, contact 6|engages contact H8 50 that lamp LGK will be lighted on picking up ofcontact I I 2 of relay GPR.

On the supply of current of reverse relative polarity to the controlwires 65 and I the neutral contacts 55 and I50 of signal control relayHR become picked up, while the polar contacts I0 and 158 of the relayare shifted from their normal to their reverse positions.

On movement of polar contact I0 of signal control relay l-IR from itsnormal to its reverse position it interrupts the circuit from Wire 2'!to wire 72, and thereby prevents the supply of current to the mechanismof either of the signals at signal IS.

On movement of the contact III of relay HR to the reverse position itengages contact 85 and establishes a circuit to permit current to besupplied to the mechanism of the signal AS or signal BS as determined bypolar contact 93 of switch repeating relay WPR.

On movement of polar contact I55 of relay HR to the reverse position itengages contact l52 to thereby permit a circuit to be establishedbetween control wire 65 and wire I40 on closing of the contact I43associated with signal BS or contact E53 associated with signal AS.

On initial movement of contact I55 of the signal control relay HR to thereverse position neither of the contacts M8 or I53 is closed, and. henceno circuit is established by contact 55 of coding relay CT to shunt thewinding of relay HR. Accordingly, current of the same uniform value ispresent in the circuit of the control wires 55 and I5. At this. time,therefore, no current is supplied by the transformer 'IR Z to thewinding of the signal indication relay GPR, and the contact H2 of thisrelay is released with the result that both of the signal indicationlamps RGK and LGK are dark.

As the switch W is assumed to be in the normal position at the time thesignal control lever K is moved from position R to position L, thewinding of the switch repeating relay WPR will be supplied by contacts44 and 45 with current of normal relative polarity, and the polarcontact 93 of this relay will be in the normal position as shown.Accordingly, on movement of contact I0 of relay HR to the reverseposition, in which it engages contact 85, a circuit is established toeffect the supply of current to the mechanism of signal AS. This circuitis traced from wire 2'! leading from terminal R of battery 30 throughneutral contacts 65-6I of relay HR, wire .68, reverse polar contacts70-85 of relay HR, wire 81, contacts 88-90 of relay WPR, wire 9|, normalpolar contacts 93-94 of relay WPR, wire 95, mechanism of signal AS, andwire 31 to terminal P of battery 30. 7

As a result of the supply of current to the operating mechanism ofsignal AS, this signal is caused to display the proceed indication,while contact I53 associated with the signal becomes closed and engagescontact I55, thereby completing the circuit from wire 65 to wire I40.This circuit is traced from wire 65 through neutral contacts I60I58 ofrelay HR, wire I5'I, reverse polar contacts I 56I 52 of relay HR, wireI50, signal controlled contacts I55-I53, and wire I40 to contact 58 ofcoding relay CT.

At this time, as a result of operation of the contact 55 of coding relayCT, the circuit shunting the winding of signal control relay HR isintermittently completed with the result that there are fluctuations inthe value of the current flowing in the circuit ofthe control wires 65and I5.

At this time, therefore, current will be supplied to transformer TRZ tothe winding of signal indication relay GPR and the contact II2 of thisrelay will be picked up. At this time as signal control lever K is inposition L, contact 6| engages'contact II8 so that a circuit isestablished to energize the lamp LGK which is thereupon lighted.

It should be observed that during the movement of the signal controllever K from position R to position L, the switch control lever SL andthe switch W remained in the normal position. Accordingly, the circuitfor shunting the winding of relay WR was maintained and the relay WKRcontinued to be energized and the normal switch indication lamp NK wasmaintained energized.

If at this time, that is, while lever K is in position L, the operatorwishes to condition the switch W and the associated signals for movementof a train from right to left from track B onto track A, he may do so byeffecting movement of the switch W from the normal to the reverseposition.

In order to effect this movement of the switch W the switch controllever SL is moved from the normal position to the reverse position,thereby efiecting the supply of current of reverse relative polarity tothe control wires I5 and I6.

On the supply of current of this relative polarity to the winding ofrelay WR polar contact 32 of relay WR is shifted to the reverse positionand effects the supply of current to the switch machine SM to cause themachine to move the switch W from the normal to the reverse position. Inaddition, contact I34 of relay WR is shifted to the reverse position,thereby interrupting the circuit for shunting the winding of relay WR.

As long as the circuit for shunting the winding of relay WR isinterrupted, current of the same uniform value is present in the circuitof the control wires I5 and I6 and no curent is supplied by transformerTRI to the winding of relay WKR with the result that the contact I02 ofthis relay is released and both of the switch indication lamps NK and PKare dark.

On movement of the switch W away from the normal position the contacts44 and 45 interrupt the circuit of the winding of the switch repeatingrelay WPR, and the neutral contacts of this relay become released withthe result that contact interrupts the circuit for supplying .current tothe mechanism of signal AS and this signal is thereupon caused todisplay a stop indication.

When signal AS displays a stop indication, contact I53 associated withthe signal is open and interrupts the circuit for shunting the windingof signal control relay HR with the result that current of the sameuniform value is present in the circuit of the control wires 65 and I6,and no current is supplied by transformer TRZ to signal indication relayGPR. Accordingly, contact I I2 of relay GPR is released and the signalindication lamps RGK and LGK are both dark.

When the switch W completes its movement to the reverse position,contacts 44 and 45 efiect the supply of current of reverse relativepolarity to the winding of relay WPR, and the neutral contacts of thisrelay thereupon become picked up, while the polar contacts of the relayare shifted to their reverse positions.

On picking up of neutral .contact 90 and shifting of polar contact 93 tothe reverse position in which it engages contact 96, a circuit isestablished to supply curent to the mechanism of signal BS.

This circuit is traced from wire 21 leading from terminal R of battery30 through neutral contacts 666'I of relay HR, wire 68, reverse .polarcontacts 'I085 of relay HR, wire 81, neutral contacts 88-90 of relayWPR, wire 9|, reverse polar contacts 9396 of relay WPR, and wire 98 toone terminal of the mechanism of signal BS, the other terminal of whichis connected by wire 3! to terminal P of battery 30.

As the mechanism of signal BS is energized, this signal is conditionedto display the proceed indication and when the signal is displaying theproceed indication, contact I48 associated with the signal is closed andengages contact I49 to establish connection between control wire 65 andwire I40 leading to contact 58 of coding relay CT. Accordingly, thecircuit shunting the winding of relay HR is intermittently completed bycontact 55 of coding relay CT, and current is supplied by transformer'IR2 to the winding of relay GPR. As lever K is in position L, contact6| engages contact II 8 so that on picking up of contact II2 of relayGPR, lamp LGK is illuminated.

Similarly, on picking up of neutral contact I22 of relay WPR, and onmovement of polar contact I24 to the reverse position at a time whencontact I34 of relay WR is also in the reverse position, the circuit forshunting the winding of the switch control relay WR is established andwill be intermittently completed by the contact 55 of coding relay CT.As a result, current will be supplied by transformer TRI to switchindication relay WKR and contact I82 will be picked up. At this timecontact II associated with the switch control lever SL engages contactI07 so that the reverse indication lamp RK is illuminated.

The system operates in substantially the same manner if while the signalcontrol lever K is in position L it is desired to effect movement of theswitch W from the reverse to the normal position. On this movement ofthe switch W and resultant change in the position of the contacts ofswitch repeating relay WPR, signal BS will be caused to display a stopindication, while when the switch W completes its movement, signal ASwill again be conditioned to display the proceed indication aspreviously described.

In similar manner, if while the signal control lever K is in theposition L, in which it conditions the signals for movement of trainsfrom right to left, the operator desires to condition the signals formovement of trains from left to right, he may do so by returning thesignal control lever K to the position R.

On this movement of the signal control lever K the polar contact 18 ofthe signal control relay HR is conditioned to interrupt the circuits forsupplying energy to both the signals AS and BS, and to establish acircuit for supplying energy to the operating mechanism of one of thesignals ISA or ISB, the particular one depending upon the positionoccupied by the polar contacts of the switch repeating relay WPR.

It will be seen that the circuit shunting the winding of the switchcontrol relay WR, is controlled jointly by the contacts of the relay WRand of the switch repeating relay WRP. It will be seen also that thiscircuit can be completed by the contact of the coding relay CT when andonly when the neutral contacts of relays WR and WRP are picked up, andthe polar contacts of these relays are in the same relative positions.This insures that an indication of the position occupied by the switch Wwill be provided only 75 when both relays and WRP are energized and thepositions of the switch W and the polar contacts of the switch controlrelay WE are in agreement; l l l l Similarly, the circuit shunting thewinding of signal control relay HR is controlled by contacts of theswitch repeating relay WRP, by contacts of the signal control relay HRand also by contacts associatedwith. the signals. It will be seen alsothat the circuit shunting the winding of the relay HR can be establishedby the contact 55 of the coding relay CT. when and only when the relaysWPR. and HR are both energized and the polar contacts of these relaysare in the same relative positions, and when, in addition, the contactassociated with anappropriate one of the signals is closed. 3

In addition, it will be seen that in the system shown in thisapplication the control wire it is common to the control circuits forboth the switch control relay WR and for the signal control relay HR.

It will be seen also that when the contact 55 of coding relay CT iseffective to establish the circuits shunting the windings of the relaysWR and HR, at which time current of unusually high value is present inthe control circuits for these relays, the circuits shunting the relaywindings are alternately established, while both shunt circuits are notcomplete at the same time.

This arrangement prevents the current of high value in the switchcontrol relay control circuit and in the signal control relay controlcircuit beingpresent simultaneously in the common wire [6, which wouldbe the case if the circuits shunting the windings of the relays WR andHR were established at the same time. Accordingly, the load placed onthe wire I6 is held at the minimum value.

In the system provided by this invention, in order for an indication tobe given of the position of the switch W or of the condition of thesignals associated with the switch, fluctuations or pulsations mustoccur in the current in the control circult of the switch control relayor of the signal control relay. If for any reason, such as failure ofthe apparatus to function in the intended manner, these fluctuations orpulsations fail to occur, when they should, no indication will be given,and hence, the system will not operate at such times to give a falseindication.

While the system provided by this invention has been illustrated anddescribed in connection with remote controlof a railway track switch andthe associated signals, it should be understood that the invention isnot limited to use in this manner, and that it may be employed whereversimilar operating conditions are encountered.

Although I have herein shown and described only one form of remotecontrol and indication system embodying my invention, it is understoodthat various changes and modifications may be made therein within thescope of the appended claims without departing, from the spirit andscope of my invention.

Having thus described my invention, what I claim is:

1. In combination, a first control device having a winding, 2. secondcontrol device having a winding, a first control circuit including afirst wire and a common wire for supplying current to the winding of thefirst control device, a second control circuit including the common wireand a second control wire for supplying current to the winding of thesecond control device, means for supplying current to the first controlcircuit, means for supplying current to the second con trol circuit,means controlled by the first control device, means controlled by thesecond control device, each of said control devices being operative whenenergized to effect a predetermined condition of the means controlledthereby, the means controlled by each control device controlling acircuit for shunting the winding of the said control device, and meansfor alternately completing said shunt circuits to thereby producefluctuations in the value of the current in said control circuits, eachof said control circuits having associated. therewith indication meansresponsive to fluctuations in the value of the current in such circuit.

2. In combination, a first control device having a winding, a secondcontrol device having a winding, a first control circuit including afirst wire and a common wire for supplying current to the winding of thefirst control device, a second control circuit including the common wireand a second control wire for supplying current to the winding of thesecond control device, means for supplying current to the first controlcircuit, means for supplying current to the second control circuit,means controlled by the first control device, means controlled by thesecond control device, each of said control devices being operative whenenergized to effect a predetermined condition of the means controlledthereby, the means controlled by each control device controlling acircuit effective when established to produce an increase in the valueof the current in the control circuit for such control device, means foralternately establishing said circuits to thereby produce fluctuationsin the value of the current in said control circuits, each of saidcontrol circuits having associated therewith means responsive tofluctuations in the value of the current in such circuit.

3. In combination, a first control device having a winding, a secondcontrol device having a winding, a first control circuit including afirst wire and a common wire for supplying current to the winding of thefirst control device, a second control circuit including the common wireand a second wire for supplying current to the winding of the secondcontrol device, means for supplying current to the first controlcircuit, means for supplying current to the second control circuit,means controlled by the first control device, means controlled by thesecond control device, each of said control devices being operative whenenergized to effect a predetermined condition of the means controlledthereby, the means controlled by each control device controlling acircult eifective when established to produce an increase in the valueof the current in the control circuit for such control device, means foralternately establishing said circuits to thereby produce fluctuationsin the value of the current in said control circuits, a firsttransformer having a primary winding connected in series with the firstcontrol wire, indication means controlled by current supplied by thesecondary winding of said transform-er, a second transformer having aprimary winding connected in series with the second control wire, andindication means controlled by current supplied by the secondary windingof said second transformer.

4. In combination, a railway track switch movable between a normal and areverse position, a plurality of signals governing movement of trainsacross said switch, a first control device having a winding, said devicebeing operative when its winding is energized with current of onerelative polarity to effect movement of the switch to one position andbeing operative when its Winding is energized with current of the otherrelative polarity to eifect movement of the switch to the otherposition, a second control device having a winding, said second controldevice being operative when its winding is energized with current of onerelative polarity to permit clearing of one of said signals and beingoperative when its winding is energized with current of the otherrelative polarity to permit clearing of a different one of said signals,a first control circuit including a first wire and a common wire forenergizing the winding of the first control device, a second controlcircuit including the common wire and a second wire for energizing thewinding of the second control device, means for selectively supplyingcurrent of one or the other relative polarity to the first controlcircuit, means for selectively supplying current of one or the otherrelative polarity to the second control circuit, means governed by theposition of the switch for establishing a circuit shunting the windingof the first control device, means governed in accordance with thecondition of said signals for establishing a circuit shunting thewinding of the second control device, and means for alternatelycompleting said shunt circuits to thereby produce fluctuations in thevalue of the current in said control circuits, each of said controlcircuits having associated therewith indication means responsive tofluctuations in the value of the current in such circuit.

HENRY S. YOUNG.

